Design of Subscale Airfoils with Full-Scale Leading
Edges for Ice Accretion Testing
Farooq Saeed, Michael S. Selig, and Michael B. Bragg
University of Illinois, Urbana, Illinois 61801
ABSTRACT
A design procedure for subscale airfoils with full-scale leading edges
that exhibit full-scale water droplet impingement characteristics in an
incompressible, inviscid flow is presented. The design procedure uses
validated airfoil design, flow analysis and water droplet impingement
simulation codes to accomplish the task. To identify and isolate
important design variables in the design, numerous trade studies were
performed. The paper presents the results of the trade studies and
briefly discusses the role of important design variable in the subscale
airfoil design. The effect of these design variables on circulation,
velocity distribution and impingement characteristics is discussed along
with the accompanying implications and compromises in the design. A
strategy to incorporate viscous effects into the design is also presented.
The paper also presents the design of a half-scale airfoil model with a 5%
upper and 20% lower full-scale surface of the Learjet 305 airfoil
leading-edge and compared its aerodynamic as well as the droplet
impingement characteristics with that of the Learjet 305 airfoil.